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(No Model.)

' G; QUINN. Grinding Machine. 'N'Q. 242,221. Patented May 31, 188i.

Nv mun. rmwm m. Wishingmn, D. C.

. UNITED STATES PATENT OFFICE.

GARRETT QUINN, OF NEW YORK, N. Y.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 242,221, dated. May 31, 1881.

Application filed February 2, 1881. (No inodel.)

To all whom it may concern:

Be it known that I, GARRETT QUINN, of the city and State of New York, have invented an Improvement in Grinding-Machines, of which the following is a specification.

Knife-grindiu g machines have been made in which the knife is held in clamps that are operated upon by screws to move the same up toward and in contact witha revolving grinding-wheel. The knife and its carriage either have a motion endwise of the knife, or else the revolving grinding-wheel is moved in the direction of its axis back and forth along the face of the knife.

In machines of this'kind itis usual to move the screws gradually by hand, so as to press the knifeinto contact with the grinding-wheel. The grinding is comparatively slow, and much time is consumed in attending upon these grinding-machines; and, beside this, the mechanic is apt to turn the screws too rapidly, and either to injure the grinding-wheel or else heat the knife that is being ground.

My invention is made for avoiding these difficulties and rendering the grinding-machine nearly automatic.

I combine with the adjusting-screws of the grinding machine grooved Wheels, a cord around each wheel, and aweight upon the cord, whereby the screws are gradually turned with a regular amount of force to keep the knife up to the grinding-wheel, and thereby render it unnecessary to move the screws by hand while the grinding operation is in progress, and I employ stopsthat arrest the movement of the knife-carriage when the knife has received the required amount of grinding.

In the drawings, Figure l is a perspective view of the grinding-machine, and Fig. 2 is a View endwise of the knife.

I have shown a machine in which my improvement is especially available. In this the base a. of the machine is extended upwardly as a frame, upon which are bearingsf for the shaft of the emery or grinding wheel b.

ais a bed sliding horizontally upon fixed ways that are behind it, and the same is moved back and forth by a pinion and rack driven by a belt, is, and there is a belt-shifter and tappets p to reverse the motion.

The knife 8 that is to be ground is bolted to the carrier t, and this may be supported at its ends on trunnions in the bearings 0, so as to be set at any desired angle and held by the clamp o. The screws 0 act to move the carrier and knife up to the grinding-wheel.

The above parts may be of any convenient character.

Upon the ends of the screws e, I place the grooved wheelsi z, and to each wheel I attach one end of a cord, 8, and wind the same around the wheel, and at the other end of the cord is a weight, 1, the size of which may be varied according to the work to be done. As the grinding progresses the weights 1 turn the screws 0 and feed up the knife toward the grinding-wheel with the proper speed of movement, and after the weights have run down the cord is easily wound another turn or two upon the wheels to raise up the weights.

The stops at 0 determine the movement of the carriage carrying the knife to be ground.

. This improvement is especially available in grinding long knives and cutters, but it may be used in grinding other articles.

I claim as my invention- The combination, with the knife-holdin g carriage and the screws for moving the same, of the cord-wheels z, cords s, weights l, and stops to determine the movement of the carriage, substantially as set forth.

Signed by me this 25th day of January, A. D. 1881.

GARRETT QUINN.

Witnesses M. J. EARLEY, THOMAS OMEARA. 

